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10. CONNECTING MAGNASTARTS IN PARALLELThe maximum Magnastart rating is 370kW, but it may be desired to start a higher ratedmotor. In this case it is sometimes possible to connect 2 or more M350 Magnastarts inparallel to achieve a larger combined rating. This should only be considered for ratingsabove 370kW, it is normally more reliable (and more economic) to use a single, correctlysized Magnastart for lower ratings.In case Magnastarts are connected in parallel the following criteria MUST be applied.i) The Magnastarts are all tapped identically, andii) The Cut-outs on all units are wired in series, so that if any unit overheats, thesystem trips.iii) The system is de-rated by 10% to allow for mismatch of individual units.iv) The rotor voltage must not exceed the Magnastart rating.It will be obvious that operating in parallel will reduce the combined maximum impedance,so this arrangement functions best with lower voltage rotors. If this is problematic, then aseries/parallel combination could be considered, and must be designed specifically for theapplication by a competent Electrical Engineer.Since the success of this use is very dependant on the motor and system design, IRISPOWERdoes not guarantee that parallel operation will be successful in all cases, and theuser must satisfy themselves that the application is appropriate.Page 16 V1.3
11. SPECIFICATIONSModel No M30B M45 M90 M125 M175 M350Max Motor Size 1 kW 37 55 110 150 200 370HP 55 75 150 200 270 500Max Starts/Hr 2 9 7 6 7 5 4Max Consecutive Starts 3 4 4 4 5 4 4Max Rotor Starting Current Amps 140 275 425 525 625 1100Max Rotor Voltage 4 Volts 600 600 800 800 1000 1200Max Rotor Voltage (HD) 5 Volts 500 500 550 600 750 900Impedance 6 Ohms 7.0 4.0 3.5 2.5 3.0 2.3Coil Insulation RatingClass F (150°C), 4,000Vac winding-ground proof testThermal Overload Cut-out 7 250Vac, 10A or 30Vdc, 5A max Normally closedDimensions 8 mm See Mechanical Outline drawingHeight A 250 260 255 360 360 430Width B 305 325 365 365 365 500Depth C 320 330 420 425 420 500Body Width D 250 270 320 320 320 420Fixings Holes Side toSideE 280 300 340 340 340 470Fixings Front to Back F 233 257 320 320 320 360Rear Fixings G 25 25 30 30 30 70Fixing Hole Size H 10 10 10 10 10 12Fixing Studs Side to Side I 215 247 285 285 285 370Channel Height J 37 37 37 37 37 37Front Panel Inset K - - - - - 95Load Studs L M8 M8 M10 M10 M12 M12Overload Cut-out Studs L M6 M6 M6 M6 M6 M6Weight 9 kg 27 36 54 75 81 165Operating Environment-25°C to +50°C ambient, 0-95% RH (non-condensing)Notes:1. With 50/60Hz, 3 phase supply. For other supply arrangements contact ADWEL.It may be possible to parallel models for greater capacity in particular circumstances. Please consult IRIS POWERwithspecific details.2. This is based on the maximum motor size starting against 1.5 x full load torque for 15 secs, mounted in a typicalunventilated metallic enclosure. For heavier duties extra or forced ventilation may be required, or a larger Magnastartchosen.3. Maximum consecutive starts are from cold. Note that the motor rating may also limit consecutive starts.4. Normal starting duties, occasional inching in both directions.5. Heavy inching, and plug braking.6. Impedance is approximate per coil at 50Hz, full load, 100% tapping. Increase 12% for 60Hz. Typical PF is 0.8.Tappings at 84% and 56% per coil allow a choice of star and delta impedances from 100% down to 3% in 17 steps.7. The Thermal Overload Cut-out should be wired to trip the starting system in case of overload (contacts open).8. On the M30, M45, M90, M125 and M175 the mounting channels may be removed and the Magnastart mounted on the M8studs protruding from the bottom of the rubber mounts. This allows these Magnastarts to be mounted in a 400mm deepenclosure.9. Weight is without packing. For normal road shipment, the Magnastarts are mounted on 50 x 75 x 430mm wooden bearers(to allow fork-lift carriage) and shrink wrapped. For air/sea export, extra packing can be arranged.Page 17 V1.3
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Page 18 and 19: Fig. 8 Mechanical OutlinePage 18 V1

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